| abstract |
ABSTRACT OF THE DISCLOSURE Oil soluble composition of matter useful as a multifunctional viscosity index modifier for oleaginous compositions comprising reaction product of: (i) (a) copolymer of ethylene and at least one other alpha-olefin moomer, said copolymer comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity ethylene-alpha-olefin copolymer segment, wherein said at least one crystallizable segment comprises at least about 10 weight percent of said copolymer chain and contains at least about 57 weight percent ethylene, wherein said low crystallinity segment contains not greater than about 53 weight percent ethylene, and wherein said copolymer has a molecular weight distribution characterized by at least one of a ratio of MW/Mn of less than 2 and a ratio of Mz/Mw of less than 1.8, and wherein at least two portions of an individual intramolecularly heterogeneous chain, each portion comprising at least 5 weight percent of said chain, differ in composition from one another by at least 7 weight percent ethylene, grafted with (b) ethylenically unsaturated carboxylic acid material having 1 to 2 carboxylic acid groups or anhydride group; and (ii) at least one of (a) polyamine having at least two reactive amino groups selected from primary amino groups, secondary amino groups, and mixtures thereof, (b) polyol, (c) polyol, and about C50 to about C400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group, and (d) polyamine having at least two reactive amino groups selected from primary amino groups,secondary amino groups, and mixtures thereof, and about C50 to about C400 hydrocarbyl substituted carboxylic acid component containing 1 to 2 carboxylic acid groups or anhydride group. |